Purdue University students, from left, Janie Stine, David Jaroch and Jessamine Osborne created a biodegradable toilet paper, called Nature's Silk, from corn. The product took top prize in the 2009 Indiana Student Corn Innovation contest.

Photo; Students and Student Life; PURDUE STUDENTS, about 50 in number, picked up this collection of trash, bottles, cans, paper, etc., along the mile of county road. Their work was displayed in front of the Tippecanoe County Courthouse downtown for...